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Article: Enhanced Charge Extraction in Organic Solar Cells through Electron Accumulation Effects Induced by Metal Nanoparticles

TitleEnhanced Charge Extraction in Organic Solar Cells through Electron Accumulation Effects Induced by Metal Nanoparticles
Authors
Issue Date2014
Citation
Energy & Environmental Science, 2014, v. 6, p. pp.3372 – 3379 How to Cite?
AbstractMetal nanoparticles (NPs) have been used to enhance the performance of thin-film devices such as organic photovoltaics. In this paper, we propose and demonstrate electron extraction enhancement induced by charge accumulation effects of metal NPs. The metal NPs (Au and Ag NPs) are embedded in a titanium oxide (TiO2) layer, functioning as a highly efficient transport layer for improving the performances of inverted organic solar cells (OSCs), which leads to significantly increased photocurrent and power conversion efficiency reaching 8.20%. Importantly, our results show that the optical plasmonic effect of metal NPs (Au NPs and Ag NPs) in the electron transport layer is a minor factor in improving the OSCs' efficiency. Instead, the charge extraction enhancement under solar illumination can be explained by the transfer of UV-excited electrons from the TiO2 electron transport layer to metal NPs and the enhanced accumulation of the electrons in metal NPs–TiO2 composites. The electron accumulation reduces the work function of the electron transport composite layer after UV illumination. The redistribution of charges in the UV-irradiated metal NPs–TiO2 system can assist the charge extraction in OSCs. Multiphysics study is also conducted to explain the effects of the charge accumulation on device performances (i.e. improving short-circuit current without degrading the open-circuit voltage). Consequently, by incorporation of metal NPs, our experimental and theoretical results show that the NPs–TiO2 transport layer, in which case the effect of doping is different from the conventional doping effects in semiconductors, exhibits very good charge extraction and collection at the electrode for efficient organic optoelectronic devices.
Persistent Identifierhttp://hdl.handle.net/10722/202885

 

DC FieldValueLanguage
dc.contributor.authorXie, Fen_US
dc.contributor.authorChoy, WCHen_US
dc.contributor.authorSha, Wen_US
dc.contributor.authorZhang, D.en_US
dc.contributor.authorZhang, S.en_US
dc.contributor.authorLi, X.en_US
dc.contributor.authorLeung, C. W.en_US
dc.contributor.authorHou, J.en_US
dc.date.accessioned2014-09-19T10:09:14Z-
dc.date.available2014-09-19T10:09:14Z-
dc.date.issued2014en_US
dc.identifier.citationEnergy & Environmental Science, 2014, v. 6, p. pp.3372 – 3379en_US
dc.identifier.urihttp://hdl.handle.net/10722/202885-
dc.description.abstractMetal nanoparticles (NPs) have been used to enhance the performance of thin-film devices such as organic photovoltaics. In this paper, we propose and demonstrate electron extraction enhancement induced by charge accumulation effects of metal NPs. The metal NPs (Au and Ag NPs) are embedded in a titanium oxide (TiO2) layer, functioning as a highly efficient transport layer for improving the performances of inverted organic solar cells (OSCs), which leads to significantly increased photocurrent and power conversion efficiency reaching 8.20%. Importantly, our results show that the optical plasmonic effect of metal NPs (Au NPs and Ag NPs) in the electron transport layer is a minor factor in improving the OSCs' efficiency. Instead, the charge extraction enhancement under solar illumination can be explained by the transfer of UV-excited electrons from the TiO2 electron transport layer to metal NPs and the enhanced accumulation of the electrons in metal NPs–TiO2 composites. The electron accumulation reduces the work function of the electron transport composite layer after UV illumination. The redistribution of charges in the UV-irradiated metal NPs–TiO2 system can assist the charge extraction in OSCs. Multiphysics study is also conducted to explain the effects of the charge accumulation on device performances (i.e. improving short-circuit current without degrading the open-circuit voltage). Consequently, by incorporation of metal NPs, our experimental and theoretical results show that the NPs–TiO2 transport layer, in which case the effect of doping is different from the conventional doping effects in semiconductors, exhibits very good charge extraction and collection at the electrode for efficient organic optoelectronic devices.en_US
dc.languageengen_US
dc.relation.ispartofEnergy & Environmental Scienceen_US
dc.titleEnhanced Charge Extraction in Organic Solar Cells through Electron Accumulation Effects Induced by Metal Nanoparticlesen_US
dc.typeArticleen_US
dc.identifier.emailXie, F: fxxie@hku.hken_US
dc.identifier.emailChoy, WCH: chchoy@eee.hku.hken_US
dc.identifier.emailSha, W: shawei@hku.hken_US
dc.identifier.authorityChoy, WCH=rp00218en_US
dc.identifier.authoritySha, W=rp01605en_US
dc.identifier.hkuros238582en_US
dc.identifier.volume6en_US
dc.identifier.spagepp.3372 – 3379en_US
dc.identifier.epagepp.3372 – 3379en_US

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